Method and device for the transport of a liquid-gas mixture in a paper making machine

Abstract

A method and device for the continuous transport of a liquid-gas mixture from an inlet reservoir having a first liquid level to a discharge chamber having a second liquid level includes a suction tube connecting the inlet reservoir and the discharge chamber, a gas separator disposed in the suction tube, and a conduit through which a gas passes to the second liquid level.

We claim: 
     
       1. A method for continuous transport of a liquid/gas mixture from a first location having a first liquid level to a second location having a second liquid level, said method comprising the steps of: separating gas from a liquid-gas stream in a path located between the first level and the second level;   guiding the gas to a space above the second level;   separating a main liquid stream from the liquid-gas stream at a separation region;   guiding the liquid-gas stream in a liquid-gas column to a level above the separation region; and   providing a pressure difference between a space disposed above the liquid-gas column and the space above the second level, the pressure above the liquid-gas column being higher than the pressure above the second liquid level.   
     
     
       2. The method of claim 1 wherein the pressure above the liquid-gas column is lower than that above the second liquid level. 
     
     
       3. The method of claim 1 wherein a returned partial stream is introduced to a space above the first liquid level. 
     
     
       4. A device for continuous transport of a liquid-gas mixture from an inlet reservoir having a first liquid level to a discharge chamber having a second liquid level, said device comprising: a suction tube connecting the inlet reservoir and the discharge chamber;   a gas separator disposed in the suction tube;   a conduit through which a gas passes to the second liquid level; and   an overflow apparatus for returning liquid to the inlet reservoir, said overflow apparatus disposed the conduit.   
     
     
       5. The device of claim 4 wherein the suction tube has openings and is limited by the gas separator by preventing gas from passing together with liquid through the suction tube, said gas separator being connected to the suction tube above said openings and being open at a bottom thereof. 
     
     
       6. The device of claim 4 wherein the gas separator is disposed below the second liquid level and has a lower end communicating with the discharge chamber and an upper end communicating with the suction tube. 
     
     
       7. The device of claim 4 wherein the suction tube has an extended portion in the shape of a funnel at an upper end thereof. 
     
     
       8. The device of claim 7 wherein the extended portion of the suction tube is disposed adjacent the second liquid level. 
     
     
       9. The device of claim 4 wherein the suction tube extends from the inlet reservoir to liquid disposed in the discharge chamber, said suction tube having an extension piece connected to the suction tube, the suction tube and extension piece defining a slit therebetween, the extension piece having a lower end in the form of a funnel that widens in a downward direction. 
     
     
       10. The device of claim 4 disposed in the vicinity of an endless belt of a paper machine, and wherein the suction tube has a slitted cross-section extending in a direction transverse to a direction of movement of the belt. 
     
     
       11. The device of claim 4 wherein the suction tube has holes communicating with air disposed above the inlet reservoir, said holes having a diameter smaller than 10% of a diameter of the suction tube.